Airplane brake



2"Slhet s-Sheat 1 Feb. 5, 1935. E. J. w. RAGSDALE ETL AI-RPLANE BRAKE Filed June 2l, l93

Feb. s, 1935.l

v E. J. W.4RAG$DALE ET AL l AIRPLANE BRAKE Filed June 2l, 1950 2 Sheets-Sheet 2 I N V ENTORS L PA. Y Tw m B2. fw, mi.. Bm oA of Patented Feb. 5, 1935 i UNITED STATES PATENT ori-ICE AmPLANE BRAKE l.

Earl J. W. Ragsdale, Norristown, Pa., and Robert B. Temple, Detroit, Mich., assignors to Budd Wheel Company, Philadelphia, Pa., a. corpora tion of Pennsylvania Application June 21.1930, serial No. 462,789

7 claims. (ci. iss-7s) 'I'lie object of our invention has been to prothe interior of the braking mechanism. 4-The duce a simple and inexpensive brake of a selfbrake band is preferably formed of pressed metal actuating or wrapping type having a smooth and of channel crossy section, the channel flanges regular wrapping action together with provision being of gradually increasing depth from the acfor insuring an accurate axial and radial relative tuator end 22 of the band to the anchor end 23. 5

positioning of the parts of the band at all times. This band is maintained in proper axial align- A further object is the provision of a superior ment with the wheel and drum by means of a st motion arrangement for supporting the series of clips 24 which are bifurcated and have anchor end of a wrapping brake band; the metal which is cut in the act of bifurcation 10 A reading of the sub-joined specification in the pressed inwardly to provide a anee spaced from 10 light of the attached drawings will render clear the bifurcated portion to guide one of the channel the manner in which we have attained these and flanges 0f the band- Any. desired number 0f other objects of our invention. -While we have these clips may be used, tWO bei-ng Shown 'in the illustrated our invention inconnection with an drawings. The band is slotted adjacent its anchor airplane brake it will be obviousto those skilled lend at 25 and this slot is substantially longer than 15 in the art that many of the principles thereof are the circumferential length of the anchor pressure applicable to other types of brake, pad 18. A pressure pad 26 is ailixed to the band In the drawings, Fig. 1 is a side elevation with adjacent this slot by any Suitable means land iS parts cut away to illustrate the construction of provided with an end portion which forms a reour improved brake, and l entrant angle withrespect to a tangent to the 20 Fig, 2 is a, cross section 0f the brake and assobrake drum at this point Aand. extends into the Slot ciated wheel parts on the line 2-2 of Fig. 1. and thereby takes the anchor reaction, thus pre-l Referring to the drawings by reference charac- Venting Wear UDOn the brake band itself. The ters, the numeral 10 indicates the axle of the DreSSlle DadlB-S 0f Substantially the Same Width vehicle and 11 a flange which may be either seeS the Slot 25 and thereby SeIVeS t0 axially guide 25 cured to the axle or formed integrally therewith. the band- The purpose of the reentrant angle The brake actuator `mechanism 12 may be an- Will be hereinafter set forth. chored to this ange by means of an anchor The slot 25 in the brake band is considerably bracket 13 bearing an arm 15 for supporting theA longer than the pad 18 even after the lug 26 is 3o actuator mechanism. This actuator mechanism inserted in this slot. This affords a lost mo- 30 forms no part of our present, invention, as any tion connection between the band and pad and suitable type of actuator mechanism may be used` thereby facilitates the Wrapping 0f the brake.v in connection with the features of the invention. A guide strip 2'7v which mayI likewise be of .The anchor bracket 13 is preferably secured to the channel section is aflixed to the anchor end of i ange 11 by means of bolts 14. This bracket ,is the brake band beyond the anchor mechanism 35 l provided at spaced peripheral points with bosses above described, and has a DOrtiOn Overlapping 16 to space guide clips 24 from the flange 11. 'Ihe the channeled operated end of the band. This function of these guide clips will be later deguide strip is of substantially the same width scribed. as the brake band proper and thereby serves to v 17 denotes an anchor flange which is radially act as a further guide for the band when actu- 40 and axially inwardly offset from the main body ated. 'I'he guide stripforms, in effect, a conof the anchor bracket and is provided with a tinuation of the anchor end of the band. In pressure pad 18 at its radial and inner axial exthis connection it should be noted that the prestremity. This pressure pad may be formed insure pad 18 operating in the slot 25 and the clips tegrally with the anchor bracket or secured to 24 serve as additional means for obtaining an '45 it in any suitable manner, as by rivets, as illus- -accurate axial 'alignment of the band at all tratedin thedrawings. The brake and the interior times. .y y of the wheel are protected from foreign matter The wheel proper is 'designated 28 and consists by means of a cover plate 19 which is preferably of an aluminum casting which is webbed as inmade of sheet aluminum and secured to the axial dicated at 29 for strengthening purpbss. This 50A flange by the same bolts 14 which secure the Wheel is provided with bearing portions 30 which anchor bracket in place. This cover plate is prorotate about the bushings 31. The brake drum vided at its inner periphery with an L-shaped 32 is provided with an overhangingflange 33y to flange 20 which acts as an oil slinger` between assist in keeping foreign matter away from the the bushing 31 about which the wheel rotates and brake band and strengthen it and is further pro- 55 vided` with a series of lugs 21 which are riveted to spaced ears 34 on the wheel proper, as indi- .cated at 35. The actuated end of the brake' y Upon the actuation of the brake, the end 22 of vthe band is expanded against the drum. VThe 'rotation of the drum tends to flex the band,

thereby causing a wrapping action, whereby the successive sections of the band are-.gradually bination, a shoe of continuously increasing ilex- `ibility from its actuated end to its anchor end,

brought into contact Withthe brake drum during the counter-clockwise rotation thereof. Since the pressure pads 18 and 26 afford a slight lost motion connection as described above, there 'will be no contact between these members at the initiation of the braking action and the wrapping action will therefore progress for a small 'fraction of a revolution of the 'drum during the wrapping of the band before any braking eiect takes piace. This insures a smooth wrapping action. 'Iheangularity of the face of the lug 18 causes the end of the band adjacent thereto to lag in its application. This insures a smoother wrapping action of the left hand side of the band, as illustrated in Fig. 1. It also prevents any sudden grab of the ends of the band adjacent to lug 18, as any sudden and violent actuation of the brake band and pressure pad 26 as moved outwardly along the -lug 18, will force this pressure padinwardly rather than outwardly by reason of the reentrant angle of this face of the lug with respect to a tangent to the band at this point.

The lban'd portions will also be accurately aligned during the braking action by reason of the4 three guiding arrangements above described.

We wish the sub-Joined claims to be read am 'cording to the spirit of the invention as interpreted in the light of the prior art, and not in a strict and literal sense.

relatively xed part of the vehicle and extending through said slot.

2. A braking rnechanisiiiincluding in cornbination, a shoe of continuously increasing flexibility from its actuated end to its anchor end,` said shoe being provided with an elongated slot and a pressure pad permanently -aixed to a relatively xed part of the vehicle and extending through said slot, the slot in said shoe being of substantially the same width as said pressure pad.

3'. A braking mechanism including,- in combination, a ilexible shoe of continuously channeled increasing cross section, a pressure pad afiixed to a fixed member adjacent the end of the shoe and extending through a slot .in the shoe.

4. A' braking mechanism including in comsaid shoe being provided with an elongated slot and a. pressure pad permanently affixed to a relatively fixed part of the Vehicle and 'extending through said slot, the slot in said shoe being of substantially the same width as said pressure pad and of greater length than said pad, whereby ving portion thereof through the lperiphery of said shoe, a pressure pad within said slot, said pressure pad being of less circumferential extent than said slot, and substantially co-ex-L tensive with said slot axially, whereby to form a 'circumferential lost motion connection and an axial guide for said shoe.

'1. A braking mechanism including in combination, a brake shoe provided with an elongated circumferentlal slot and a pressure pad extending through said slot and serving to anchor said brake shoe; the anchor face o1' said pressure pad forming a reentrant anglewith respect to a tangent to the shoe at the point o! y intersection therewith.

EARL J. W. RAGSDALE. ROBERT B. TEIWPLE. 

